植物油微胶囊沥青混合料的微观力学性能及自愈合机制

doi:10.11896/cldb.22090060

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Abstract To study the micromechanical properties and self-healing mechanism of vegetable oil microencapsulated asphalt mixture, the asphalt microcracks model was constructed based on the 12-molecule asphalt model by molecular dynamics methods. Oleic acid, linoleic acid, and ethyl tetralin were used as the core material of the microcapsules. The self-healing process of asphalt microcracks was investigated during the release of core materials. And the self-diffusion coefficients of asphalt molecules were calculated to explore the healing mechanism with different core materials. Moreover, the asphalt-aggregate interface model was constructed, and indexes including cohesion energy, adhesion energy, and adhesion strength were used to analyze the microscopic properties of the asphalt-aggregate interface incorporating different core materials. The results implied that the release of the core material accelerated the self-diffusion of asphalts, improved the self-healing efficiency of micro-cracks, and the self-healing efficiency increased with temperature. Due to the release of core materials, the cohesion energy and adhesion energy of aged asphalts increased by more than 37.2% and 36.8%, and the adhesion strength of the interface was also improved. Furthermore, compared with petroleum-based regenerant, vegetable oil could be better in promoting micro-cracks healing. Molecular dynamics could be utilized in deeply exploring the self-healing mechanism of microcapsule asphalt pavement, and providing a feasible method for the design and selection of microcapsule core materials.

Key words： asphalt mixture microcapsules self-healing molecular dynamics cohesion energy adhesion energy adhesion strength

Published: 25 February 2024 Online: 2024-03-01

CLC number:

U416.217

Fund:National Natural Science Foundation of China (51508428), Key R & D and Transformation Project of Qinghai Province (2021-QY-207), and Science and Technology Project of Qinghai Provincial Communication Department (2022-01).

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	Articles by authors
	TANG Wen
	KUANG Qiang
	ZHANG Yuxiang
	LYU Yuejing

Cite this article:

TANG Wen,KUANG Qiang,ZHANG Yuxiang, et al. Micromechanical Properties and Self-healing Mechanism of Vegetable Oil Microencapsulated Asphalt Mixture[J]. Materials Reports, 2024, 38(4): 22090060-7.

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https://www.mater-rep.com/EN/10.11896/cldb.22090060 OR https://www.mater-rep.com/EN/Y2024/V38/I4/22090060

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